Like most everyone else said it goes by what I bring, and for me what i'm shooting at. I'm i'm at 100 yards doing some precision scoped rifle shooting with my Ruger 204 or Savage 17hmr, i'll go through about 50 to 75 rounds. That includes saving 10 or 20 rounds to shoot at dimes and spent shell casings.
Open sights with an SKS, Mini 14, or M1 Garand at 100 yards, shooting at paper i'll probably shoot around 60 rounds per rifle, usually i'll bring two diferent ones. Bolt actions, i'll probably shoot the same amount.
Then if i'm at 50 yards shooting clays and cans for plinking fun it varies big time. Using my 10/22 i'll blow through about 200 rounds, my Kel Tec Sub 2000, probably about 100 rounds.
It all varies on what I bring and what I wanna shoot at.